1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ART_RUNTIME_HANDLE_WRAPPER_H_
18 #define ART_RUNTIME_HANDLE_WRAPPER_H_
19 
20 #include "base/macros.h"
21 #include "handle.h"
22 #include "obj_ptr.h"
23 
24 namespace art HIDDEN {
25 
26 // A wrapper which wraps around Object** and restores the pointer in the destructor.
27 // TODO: Delete
28 template<class T>
29 class HandleWrapper : public MutableHandle<T> {
30  public:
HandleWrapper(T ** obj,const MutableHandle<T> & handle)31   HandleWrapper(T** obj, const MutableHandle<T>& handle)
32      : MutableHandle<T>(handle), obj_(obj) {
33   }
34 
35   HandleWrapper(const HandleWrapper&) = default;
36 
~HandleWrapper()37   ~HandleWrapper() {
38     *obj_ = MutableHandle<T>::Get();
39   }
40 
41  private:
42   T** const obj_;
43 };
44 
45 
46 // A wrapper which wraps around ObjPtr<Object>* and restores the pointer in the destructor.
47 // TODO: Add more functionality.
48 template<class T>
49 class HandleWrapperObjPtr : public MutableHandle<T> {
50  public:
HandleWrapperObjPtr(ObjPtr<T> * obj,const MutableHandle<T> & handle)51   HandleWrapperObjPtr(ObjPtr<T>* obj, const MutableHandle<T>& handle)
52       : MutableHandle<T>(handle), obj_(obj) {}
53 
54   HandleWrapperObjPtr(const HandleWrapperObjPtr&) = default;
55 
~HandleWrapperObjPtr()56   ~HandleWrapperObjPtr() {
57     *obj_ = MutableHandle<T>::Get();
58   }
59 
60  private:
61   ObjPtr<T>* const obj_;
62 };
63 
64 }  // namespace art
65 
66 #endif  // ART_RUNTIME_HANDLE_WRAPPER_H_
67